The discussion of ra’atan culminates, at the end of the chapter, in a beautiful story about Rabbi Yehoshua ben Levi, one of the greatest Talmudic sages. Most rabbis, the Gemara says, would flee anyone afflicted with the disease, even avoiding the alleys where they lived. But Yehoshua ben Levi would seek out lepers and study Torah with them, confident that Torah itself would protect him from getting sick. This extraordinary selflessness earned its reward at the end of his life, when the dying Yehoshua managed to play a trick on the Angel of Death.You can read a couple of versions of this story in Helen Spurling's excellent translation of "Hebrew Visions of Hell and Paradise" in Old Testament Pseudepigrapha: More Noncanonical Scriptures volume 1.
When the Angel approached him, Yehoshua asked to be shown his place in paradise before he died. Once the Angel took him there, the rabbi “jumped and fell into that side,” slipping into paradise while still alive. Such was his virtue that he was allowed to stay, and “Elijah the Prophet announced before him: Make way for the son of Levi, make way for the son of Levi.” Still, there was a limit to what even Yehoshua ben Levi could achieve. On the way to paradise he seized the Angel of Death’s knife and refused to give it back, hoping in this way to abolish death forever; but “a Divine Voice emerged and said to him: ‘Give it to him, as it is necessary to kill the created beings.’ ” However inscrutable it may remain to us, the rabbis are sure that death is part of God’s plan for the universe.
Earlier Daf Yomi columns are noted here and links. Cross-file under Old Testament Pseudepigrapha Watch.